Just change PredicateBuilder
to use delegates instead of expression trees and use lambdas to build the results:
public static class DelegatePredicateBuilder
{
public static Func<T, bool> True<T>() { return f => true; }
public static Func<T, bool> False<T>() { return f => false; }
public static Func<T, bool> Or<T>(this Func<T, bool> expr1,
Func<T, bool> expr2)
{
return t => expr1(t) || expr2(t);
}
public static Func<T, bool> And<T>(this Func<T, bool> expr1,
Func<T, bool> expr2)
{
return t => expr1(t) && expr2(t);
}
}